I did this in liferay 6.23 and am about to convert it to 7
basic approach was to create an array with the event id, epoch and viewurl and then sort on epoch before listing
I used different settings in the standard asset publisher configuration to decide if it was just future events or all events to be listed.
This has som eside effects like "throwing away" past evens from the x sleected by asste publisher so sometimes you had short lists when you may expect more, but of you know your data that is manageable.
<#assign array= [] />
<#list entries as curEntry>
<#assign calendarBooking = calendarBookingService.getCalendarBooking(curEntry.getClassPK()) />
<#assign startTime = calendarBooking.getStartTime() />
<#assign assetRenderer = curEntry.getAssetRenderer() />
<#assign entryTitle = htmlUtil.escape(assetRenderer.getTitle(locale)) />
<#assign viewURL = assetPublisherHelper.getAssetViewURL(renderRequest, renderResponse, curEntry) />
<#assign viewURL = assetRenderer.getURLViewInContext(renderRequest, renderResponse, viewURL) />
<#assign array = array + [{"classPK":curEntry.getClassPK() , "epoch":startTime, "viewURL":viewURL } ] />
<!--#list-->
<#list array?sort_by("epoch") as i>
<#assign calendarBooking = calendarBookingService.getCalendarBooking(i.classPK) />
<#assign viewLink = i.viewURL />
<#assign eventId= i.classPK />
<#assign viewLinkwBack= httpUtil.setParameter(viewLink,"backURL", backURL) />
<#assign startDate = i.epoch?number_to_datetime />
<#assign endDate = calendarBooking.getEndTime()?number_to_datetime />
<#assign allDay = calendarBooking.getAllDay() />
<#assign times = calendarBooking.getStartTime() />
<#assign desc = calendarBooking.getDescription(locale) />
<#assign location = htmlUtil.escape(calendarBooking.getLocation()) />
<#assign sTime = startDate?time />
...
...
...
